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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Book value of financial assets representing exposure to credit risk (Details) - Credit risk - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Assets R$ 10,218,440 R$ 10,409,887
Cash and cash equivalents    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Assets 6,835,057 3,249,127
Marketable securities    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Assets 2,396,857 6,330,334
Derivative financial instruments    
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT    
Financial Assets R$ 986,526 R$ 830,426